The pupillary light reflex is part of the control mechanism that adjusts the amount of light that enters the eye. Rods and cones, and intrinsically photosensitive retinal ganglion cells detect the amount of light falling on the retina and send axons within the optic nerve and optic tract to the olivary pretectal nucleus in the midbrain. Connections to the Edinger-Westphal nuclei on both left and right sides trigger preganglionic parasympathetic neurones that send axons within the oculomotor nerve to the ciliary ganglion. Postganglionic parasympathetic neurones run from here within short ciliary nerves to the sphincter pupillae muscle in the eye. When bright light enters one eye both eyes react through this reflex to constrict the pupil and limit the amount of light entering the eye.
Music:
Twist One by Gregory David
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8 ноя 2023
